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android_kernel_xiaomi_sm8350/include/asm-m68k/sun3_pgtable.h
Roman Zippel 12d810c1b8 m68k: discontinuous memory support 
Fix support for discontinuous memory

Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-31 07:58:14 -07:00

239 lines
8.3 KiB
C
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#ifndef _SUN3_PGTABLE_H
#define _SUN3_PGTABLE_H
#include <asm/sun3mmu.h>
#ifndef __ASSEMBLY__
#include <asm/virtconvert.h>
#include <linux/linkage.h>
/*
* This file contains all the things which change drastically for the sun3
* pagetable stuff, to avoid making too much of a mess of the generic m68k
* `pgtable.h'; this should only be included from the generic file. --m
*/
/* For virtual address to physical address conversion */
#define VTOP(addr) __pa(addr)
#define PTOV(addr) __va(addr)
#endif /* !__ASSEMBLY__ */
/* These need to be defined for compatibility although the sun3 doesn't use them */
#define _PAGE_NOCACHE030 0x040
#define _CACHEMASK040 (~0x060)
#define _PAGE_NOCACHE_S 0x040
/* Page protection values within PTE. */
#define SUN3_PAGE_VALID (0x80000000)
#define SUN3_PAGE_WRITEABLE (0x40000000)
#define SUN3_PAGE_SYSTEM (0x20000000)
#define SUN3_PAGE_NOCACHE (0x10000000)
#define SUN3_PAGE_ACCESSED (0x02000000)
#define SUN3_PAGE_MODIFIED (0x01000000)
/* Externally used page protection values. */
#define _PAGE_PRESENT (SUN3_PAGE_VALID)
#define _PAGE_ACCESSED (SUN3_PAGE_ACCESSED)
#define PTE_FILE_MAX_BITS 28
/* Compound page protection values. */
//todo: work out which ones *should* have SUN3_PAGE_NOCACHE and fix...
// is it just PAGE_KERNEL and PAGE_SHARED?
#define PAGE_NONE __pgprot(SUN3_PAGE_VALID \
| SUN3_PAGE_ACCESSED \
| SUN3_PAGE_NOCACHE)
#define PAGE_SHARED __pgprot(SUN3_PAGE_VALID \
| SUN3_PAGE_WRITEABLE \
| SUN3_PAGE_ACCESSED \
| SUN3_PAGE_NOCACHE)
#define PAGE_COPY __pgprot(SUN3_PAGE_VALID \
| SUN3_PAGE_ACCESSED \
| SUN3_PAGE_NOCACHE)
#define PAGE_READONLY __pgprot(SUN3_PAGE_VALID \
| SUN3_PAGE_ACCESSED \
| SUN3_PAGE_NOCACHE)
#define PAGE_KERNEL __pgprot(SUN3_PAGE_VALID \
| SUN3_PAGE_WRITEABLE \
| SUN3_PAGE_SYSTEM \
| SUN3_PAGE_NOCACHE \
| SUN3_PAGE_ACCESSED \
| SUN3_PAGE_MODIFIED)
#define PAGE_INIT __pgprot(SUN3_PAGE_VALID \
| SUN3_PAGE_WRITEABLE \
| SUN3_PAGE_SYSTEM \
| SUN3_PAGE_NOCACHE)
/*
* Page protections for initialising protection_map. The sun3 has only two
* protection settings, valid (implying read and execute) and writeable. These
* are as close as we can get...
*/
#define __P000 PAGE_NONE
#define __P001 PAGE_READONLY
#define __P010 PAGE_COPY
#define __P011 PAGE_COPY
#define __P100 PAGE_READONLY
#define __P101 PAGE_READONLY
#define __P110 PAGE_COPY
#define __P111 PAGE_COPY
#define __S000 PAGE_NONE
#define __S001 PAGE_READONLY
#define __S010 PAGE_SHARED
#define __S011 PAGE_SHARED
#define __S100 PAGE_READONLY
#define __S101 PAGE_READONLY
#define __S110 PAGE_SHARED
#define __S111 PAGE_SHARED
/* Use these fake page-protections on PMDs. */
#define SUN3_PMD_VALID (0x00000001)
#define SUN3_PMD_MASK (0x0000003F)
#define SUN3_PMD_MAGIC (0x0000002B)
#ifndef __ASSEMBLY__
/*
* Conversion functions: convert a page and protection to a page entry,
* and a page entry and page directory to the page they refer to.
*/
#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
pte_val(pte) = (pte_val(pte) & SUN3_PAGE_CHG_MASK) | pgprot_val(newprot);
return pte;
}
#define pmd_set(pmdp,ptep) do {} while (0)
static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
{
pgd_val(*pgdp) = virt_to_phys(pmdp);
}
#define __pte_page(pte) \
((unsigned long) __va ((pte_val (pte) & SUN3_PAGE_PGNUM_MASK) << PAGE_SHIFT))
#define __pmd_page(pmd) \
((unsigned long) __va (pmd_val (pmd) & PAGE_MASK))
static inline int pte_none (pte_t pte) { return !pte_val (pte); }
static inline int pte_present (pte_t pte) { return pte_val (pte) & SUN3_PAGE_VALID; }
static inline void pte_clear (struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
pte_val (*ptep) = 0;
}
#define pte_pfn(pte) (pte_val(pte) & SUN3_PAGE_PGNUM_MASK)
#define pfn_pte(pfn, pgprot) \
({ pte_t __pte; pte_val(__pte) = pfn | pgprot_val(pgprot); __pte; })
#define pte_page(pte) virt_to_page(__pte_page(pte))
#define pmd_page(pmd) virt_to_page(__pmd_page(pmd))
static inline int pmd_none2 (pmd_t *pmd) { return !pmd_val (*pmd); }
#define pmd_none(pmd) pmd_none2(&(pmd))
//static inline int pmd_bad (pmd_t pmd) { return (pmd_val (pmd) & SUN3_PMD_MASK) != SUN3_PMD_MAGIC; }
static inline int pmd_bad2 (pmd_t *pmd) { return 0; }
#define pmd_bad(pmd) pmd_bad2(&(pmd))
static inline int pmd_present2 (pmd_t *pmd) { return pmd_val (*pmd) & SUN3_PMD_VALID; }
/* #define pmd_present(pmd) pmd_present2(&(pmd)) */
#define pmd_present(pmd) (!pmd_none2(&(pmd)))
static inline void pmd_clear (pmd_t *pmdp) { pmd_val (*pmdp) = 0; }
static inline int pgd_none (pgd_t pgd) { return 0; }
static inline int pgd_bad (pgd_t pgd) { return 0; }
static inline int pgd_present (pgd_t pgd) { return 1; }
static inline void pgd_clear (pgd_t *pgdp) {}
#define pte_ERROR(e) \
printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
#define pmd_ERROR(e) \
printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
#define pgd_ERROR(e) \
printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
/*
* The following only work if pte_present() is true.
* Undefined behaviour if not...
* [we have the full set here even if they don't change from m68k]
*/
static inline int pte_read(pte_t pte) { return 1; }
static inline int pte_write(pte_t pte) { return pte_val(pte) & SUN3_PAGE_WRITEABLE; }
static inline int pte_exec(pte_t pte) { return 1; }
static inline int pte_dirty(pte_t pte) { return pte_val(pte) & SUN3_PAGE_MODIFIED; }
static inline int pte_young(pte_t pte) { return pte_val(pte) & SUN3_PAGE_ACCESSED; }
static inline int pte_file(pte_t pte) { return pte_val(pte) & SUN3_PAGE_ACCESSED; }
static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_WRITEABLE; return pte; }
static inline pte_t pte_rdprotect(pte_t pte) { return pte; }
static inline pte_t pte_exprotect(pte_t pte) { return pte; }
static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_MODIFIED; return pte; }
static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_ACCESSED; return pte; }
static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) |= SUN3_PAGE_WRITEABLE; return pte; }
static inline pte_t pte_mkread(pte_t pte) { return pte; }
static inline pte_t pte_mkexec(pte_t pte) { return pte; }
static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= SUN3_PAGE_MODIFIED; return pte; }
static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= SUN3_PAGE_ACCESSED; return pte; }
static inline pte_t pte_mknocache(pte_t pte) { pte_val(pte) |= SUN3_PAGE_NOCACHE; return pte; }
// use this version when caches work...
//static inline pte_t pte_mkcache(pte_t pte) { pte_val(pte) &= SUN3_PAGE_NOCACHE; return pte; }
// until then, use:
static inline pte_t pte_mkcache(pte_t pte) { return pte; }
extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
/* Find an entry in a pagetable directory. */
#define pgd_index(address) ((address) >> PGDIR_SHIFT)
#define pgd_offset(mm, address) \
((mm)->pgd + pgd_index(address))
/* Find an entry in a kernel pagetable directory. */
#define pgd_offset_k(address) pgd_offset(&init_mm, address)
/* Find an entry in the second-level pagetable. */
static inline pmd_t *pmd_offset (pgd_t *pgd, unsigned long address)
{
return (pmd_t *) pgd;
}
static inline unsigned long pte_to_pgoff(pte_t pte)
{
return pte.pte & SUN3_PAGE_PGNUM_MASK;
}
static inline pte_t pgoff_to_pte(unsigned off)
{
pte_t pte = { off + SUN3_PAGE_ACCESSED };
return pte;
}
/* Find an entry in the third-level pagetable. */
#define pte_index(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE-1))
#define pte_offset_kernel(pmd, address) ((pte_t *) __pmd_page(*pmd) + pte_index(address))
/* FIXME: should we bother with kmap() here? */
#define pte_offset_map(pmd, address) ((pte_t *)kmap(pmd_page(*pmd)) + pte_index(address))
#define pte_offset_map_nested(pmd, address) pte_offset_map(pmd, address)
#define pte_unmap(pte) kunmap(pte)
#define pte_unmap_nested(pte) kunmap(pte)
/* Macros to (de)construct the fake PTEs representing swap pages. */
#define __swp_type(x) ((x).val & 0x7F)
#define __swp_offset(x) (((x).val) >> 7)
#define __swp_entry(type,offset) ((swp_entry_t) { ((type) | ((offset) << 7)) })
#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
#endif /* !__ASSEMBLY__ */
#endif /* !_SUN3_PGTABLE_H */
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